| 摘要 |
PROBLEM TO BE SOLVED: To increase breakdown voltage and enhance reliability by dissolving one or more of n-octadecylsuccinic acid, its salt, isooctadecylsuccinic acid, and its salt. SOLUTION: One or more of n-octadecylsuccinic acid, n-octadecylsuccinic acid salt, isooctadecylsuccinic acid, and isooctadecylsuccinic acid salt, are dissolved as a main solute in polyhydric alcohol. The dissolution amount of the solute is in the range of 1-30 wt.%. A substance such as ammonium borate, mannitol, sorbitol, inositol, polyethylene glycol, or the like is also dissolved as another component. The electrolyte solution is prepared by dissolving the main solute such as n-octadecylsucinic acid or isooctadecylsuccinic acid, and the component such as ammonium borate in polyhydric alcohol by raising the temperature to about 130 deg.C and then cooling down, and by leading ammonium gas into the solution and mixing to adjust pH of the electrolyte solution.
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